html,
body{
    height: 100vh;
    width: 100vw;
    overflow: hidden;
    /*position: relative;*/
    margin: 0;
    padding: 0;
    left: 0;
    top: 0;
    user-select: none;
    background: url('../images/bgc.png') no-repeat;
    font-family: Microsoft Yahei;
}